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Frequency of Negative Acid-Fast Bacilli Smear and Extrapulmonary Involvement.*
| Incidence | ||
| Variable | MTB | MAC |
| Sputum AFB smear negative | 15/35 (43%) | 38/45 (84%) |
| BAL AFB smear negative | 4/8 (50%) | 6/6 (100%) |
| Extrapulmonary involvement | ||
| Blood | 4 | 27 |
| Gastrointestinal tract | 5 | 26 |
| Bone marrow | 1 | 4 |
| Lymph node | 4 | 1 |
| Cerebrospinal fluid | 3 | 1 |
| Soft tissue | 2 | - |
*AFB = acid-fast bacilli; BAL = bronchoalveolar lavage; MAC = Mycobacterium avium complex; MTB = Mycobacterium tuberculosis.
